12th Chemistry Monthly Test - 1( Metallurgy )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1( Metallurgy )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which one of the following element is present as an impurity in pig iron?

Phosphorus
Manganese
Carbon
Silicon

The percentage of carbon in high carbon steel is_________

0.5 - 1%
0.15 - 1.5%
0.15 - 1.5%
0.15 - 0.3%

In acid leaching process, the insoluble sulphide is converted into soluble sulphate and elemental_________

carbon
lead
sulphur
zinc

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

magnetic properties
chemical properties
physical properties
melting point

Which of the following is used for concentrating ore in metallurgy?

Leaching
Roasting
Froth floatation
Both (a) and (c)

Which of the following plot gives Ellingham diagram

\(\Delta SVsT\)
\(\Delta { G }^{ 0 }VsT\)
\(\Delta { G }^{ 0 }Vs\cfrac { 1 }{ T } \)
\(\Delta { G }^{ 0 }Vs{ T }^{ 2 }\)

Which among the following reaction represents the formation of slag?
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)

\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)

\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (l) }+{ 3CO }_{ 2(g) }\)

\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)
Flux is a substance which is used to convert
Mineral into silicate

Infusible impurities to soluble impurities

Soluble impurities to infusible impurities

All of these

Ignition mixture used in aluminothermite process is

Cr + AI₂O₃
Mg + BaO₂
AI + Cr₂O₃
Ba+MgO

Electrochemical process is used to extract

Iron
Lead
Sodium
silver

Concentration of copper glance is done by

leaching
magnetic separation
froth flotation
hydraulic washing

The process of heating of copper pyrites to remove sulphur is called

froth flotation
roasting
calcination
smelling

Gibb's free energy is given by_______

\(\Delta { G }^{ 0 }=-nF{ E }^{ 0 }\)
\(\Delta { G }^{ o }=nF\)
\(\Delta { G }^{ o }=nF{ E }^{ o }\)
\(\Delta { E }^{ o }=-nF{ G }^{ 0 }\)

Steel is an alloy of___________

iron and carbon
iron and calcium
copper and carbon
copper and iron

Sodium cyanide solution is used to extract _________from its ores

copper
silver
gold
both (b) and (c)

Cinnabar is the sulphide ore of_________metal.

Part - B

Generic 2 - Answer All Question

Give reason : Extraction of copper directly from sulphide ores is less favourable than that from its oxide ores through reduction.

What is Ellingham diagram? or
What does Ellingham diagram represent?
Discuss the use of an acidic flux in metallurgy.

Name some common methods of ore concentration.

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

What is the role of graphite rods in the electro metallurgy of aluminium?

What are the various steps involved in extraction of pure metals from their ores?

What are the different methods of concentration of ores?

Why is the froth floatation method selected for the concentration of sulphide ores?

Why are sulphide ores converted to oxide form before reduction to metal?

Name the ore that can be concentrated by magnetic separation method.

Define roasting,

The reaction
\({ Cr }_{ 2 }{ O }_{ 3 }+2{ Al }_{ (s) }\longrightarrow { Al }_{ 2 }O_{ 3 }+2Cr\)
\(\Delta { G }^{ 0 }=-421KJ\) is thermodynamically feasible why does it not take place at room temperature?
Name the various refining process

Write the two similarities between calcination and roasting.

Name and discuss the principle involved in obtaining silicon of high purity.

List out the commercial uses of iron.

Part - C

Generic 3 - Answer All Question

Copper and silver lie low in the electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.

Mention the uses of copper
Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

What is meant by aluminotherrnitc process?

What is vapour phase method?

What are the applications of the Ellingham diagram?

Explain how the metal oxide is converted into metal using carbon as a reducing agent.

List the applications of gold

Write the molecular composition of the following ores and mention it metal : magnetite, calamine and bauxite.
Define the term slag.

(A)Using the Ellingham diagram given below:

Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(C) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K

Explain zone refining process with an example using the Ellingham diagram given below

Part - D

Generic 5 - Answer All Question

What is zone refining? Describe the principle involved in the purification of the metal by this method.
Explain refining of titanium by Van-Arkel method.

Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.

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11Th Standard

10Th Standard

9Th Standard

12th Chemistry Monthly Test - 1( Metallurgy )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1( Metallurgy )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

Which one of the following element is present as an impurity in pig iron?

The percentage of carbon in high carbon steel is_________

In acid leaching process, the insoluble sulphide is converted into soluble sulphate and elemental_________

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

Which of the following is used for concentrating ore in metallurgy?

Which of the following plot gives Ellingham diagram

Which among the following reaction represents the formation of slag?

Flux is a substance which is used to convert

Ignition mixture used in aluminothermite process is

Electrochemical process is used to extract

Concentration of copper glance is done by

The process of heating of copper pyrites to remove sulphur is called

Gibb's free energy is given by_______

Steel is an alloy of___________

Sodium cyanide solution is used to extract _________from its ores

Cinnabar is the sulphide ore of_________metal.

Part - B

Generic 2 - Answer All Question

Give reason : Extraction of copper directly from sulphide ores is less favourable than that from its oxide ores through reduction.

What is Ellingham diagram? or What does Ellingham diagram represent?

Discuss the use of an acidic flux in metallurgy.

Name some common methods of ore concentration.

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

What is the role of graphite rods in the electro metallurgy of aluminium?

What are the various steps involved in extraction of pure metals from their ores?

What are the different methods of concentration of ores?

Why is the froth floatation method selected for the concentration of sulphide ores?

Why are sulphide ores converted to oxide form before reduction to metal?

Name the ore that can be concentrated by magnetic separation method.

Define roasting,

The reaction \({ Cr }_{ 2 }{ O }_{ 3 }+2{ Al }_{ (s) }\longrightarrow { Al }_{ 2 }O_{ 3 }+2Cr\) \(\Delta { G }^{ 0 }=-421KJ\) is thermodynamically feasible why does it not take place at room temperature?

Name the various refining process

Write the two similarities between calcination and roasting.

Name and discuss the principle involved in obtaining silicon of high purity.

List out the commercial uses of iron.

Part - C

Generic 3 - Answer All Question

Copper and silver lie low in the electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.

Mention the uses of copper

Explain the following terms with suitable examples. (i) Gangue (ii) slag

What is meant by aluminotherrnitc process?

What is vapour phase method?

What are the applications of the Ellingham diagram?

Explain how the metal oxide is converted into metal using carbon as a reducing agent.

List the applications of gold

Write the molecular composition of the following ores and mention it metal : magnetite, calamine and bauxite.

Define the term slag.

Explain zone refining process with an example using the Ellingham diagram given below

Part - D

Generic 5 - Answer All Question

What is zone refining? Describe the principle involved in the purification of the metal by this method.

Explain refining of titanium by Van-Arkel method.

Describe the role of the following in the process mentioned. (i) Silica in the extraction of copper. (ii) Cryolite in the extraction of aluminium. (iii) Iodine in the refining of Zirconium. (iv) Sodium cyanide in froth floatation.

Explain the principle of electrolytic refining with an example.

Write a short note on electrochemical principles of metallurgy.

How can you separate alumina from silica in a bauxite ore

Comment

Other Study material

12th Chemistry Weekly Test - 3 ( Chemistry in Ever

What is Ellingham diagram? or
What does Ellingham diagram represent?

The reaction
\({ Cr }_{ 2 }{ O }_{ 3 }+2{ Al }_{ (s) }\longrightarrow { Al }_{ 2 }O_{ 3 }+2Cr\)
\(\Delta { G }^{ 0 }=-421KJ\) is thermodynamically feasible why does it not take place at room temperature?

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.